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JamesPa
@jamespa
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Illustrious Member
Joined: Apr 3, 2023
Last seen: Nov 12, 2025
Profile Activity
Topics: 18 / Replies: 3338
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RE: ASHP & Radiator Sizing - Measuring Heat Loss

Firstly, your method may well work, Im jolly impressed and please continue to post to inform us all! In response to your comment above a) I ob...

9 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

OK. 16kW is not compatible with 22mm pipework, and barely compatible with 28mm at a typical design DT across the radiators of 5C/p> That said 16kW...

9 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

If you remove the buffer you will also need to remove the secondary pump. Re your concern, it depends. Some further detail will help determine. ...

9 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: ASHP & Radiator Sizing - Measuring Heat Loss

What is your concern triggering the question. I am impressed at trying to determine individual rooms, I was content to determine whole house by meas...

9 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Octopus design temperatures confusion

No to the first. You can reduce the temperature of the other rooms by adjusting the lockshield valves. You have to do this anyway because radiators ...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

Thanks Sadly with a 60cm high tank I think the chances of maintaining stratification (IE a temperature gradient from top to bottom, which is wha...

9 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Octopus design temperatures confusion

Not exactly. Type 11 = 1 panel, set of fins, type 21 = 2 panels 1 set of fins, type 22 = 2 panels 2 sets of fins. Unfortunately SC could be 11 or 2...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Octopus design temperatures confusion

I suspect 60dc120 means 60cm high 120cm long double convector. SC single convector. Heat loss same so good, only issue seems to be rad size/flow te...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Octopus design temperatures confusion

The temperatures you quote are the standard mcs minimum design temperatures. The MCS and grant rules allow them to be raised but not reduced. Try pu...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: How To Balance Radiators & the Role of the Lockshield Valve: A Homeowner's Guide

Sorry I didn't spot the pictures above. Buffer tank looks very squat (which would explain lots). How high is it and what is the vertical distan...

9 months ago
Forum
Thermostats, Volumisers, Buffer Tanks, TRVs, Pumps, Piping, Valves, Radiators & Controls
Reply
RE: Vaillant arotherm plus heat pump frost protection

@kentuk It occurs to me, have you got a timed heating schedule and if so what is it. Can you tell me why the indoor temperature was so low in the ...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
Reply
RE: Winter climatic curves v Spring/Autumn climatic curves

Very sensible (you, not your installer). I suggest (if you haven't already) you set any TRVs to well above the desired temperature and any thermost...

9 months ago
Forum
Air Source Heat Pumps (ASHPs)
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